linux-kernel - [PATCH 5.4 224/389] iommu/arm-smmu: qcom_iommu: Add of_node

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Message-Id: <20220823080124.953975239@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:25:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Liang He <windhl@....com>,
        Will Deacon <will@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 224/389] iommu/arm-smmu: qcom_iommu: Add of_node_put() when breaking out of loop

From: Liang He <windhl@....com>

[ Upstream commit a91eb6803c1c715738682fece095145cbd68fe0b ]

In qcom_iommu_has_secure_context(), we should call of_node_put()
for the reference 'child' when breaking out of for_each_child_of_node()
which will automatically increase and decrease the refcount.

Fixes: d051f28c8807 ("iommu/qcom: Initialize secure page table")
Signed-off-by: Liang He <windhl@....com>
Link: https://lore.kernel.org/r/20220719124955.1242171-1-windhl@126.com
Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/qcom_iommu.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/qcom_iommu.c b/drivers/iommu/qcom_iommu.c
index 280de92b332e..b6e546b62a7c 100644
--- a/drivers/iommu/qcom_iommu.c
+++ b/drivers/iommu/qcom_iommu.c
@@ -785,9 +785,12 @@ static bool qcom_iommu_has_secure_context(struct qcom_iommu_dev *qcom_iommu)
 {
 	struct device_node *child;
 
-	for_each_child_of_node(qcom_iommu->dev->of_node, child)
-		if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec"))
+	for_each_child_of_node(qcom_iommu->dev->of_node, child) {
+		if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec")) {
+			of_node_put(child);
 			return true;
+		}
+	}
 
 	return false;
 }
-- 
2.35.1